It’s responding to claims by NSA-whistleblower Edward Snowden, published by The Intercept, that the NSA and GCHQ gained access to the keys and were able to decrypt voice and data communications without alerting users, networks or governments.

In a statement, the company says: “We take this publication very seriously and will devote all resources necessary to fully investigate and understand the scope of such sophisticated techniques.”

Earlier this month, a UK court ruled that GCHQ illegally accessed millions of personal communications collected by the NSA.